linux-kernel - Re: [PATCH] tools perf: set vmlinux_path__nr_entries to 0 in vmlinux_path_

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Message-ID: <20150515021731.GB19104@sejong>
Date:	Fri, 15 May 2015 11:17:31 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	paulus@...ba.org, a.p.zijlstra@...llo.nl, mingo@...hat.com,
	acme@...nel.org, jolsa@...nel.org, adrian.hunter@...el.com,
	dsahern@...il.com, linux-kernel@...r.kernel.org,
	lizefan@...wei.com, pi3orama@...wei.com
Subject: Re: [PATCH] tools perf: set vmlinux_path__nr_entries to 0 in
 vmlinux_path__exit.

Hello,

On Thu, May 14, 2015 at 12:22:30PM +0000, Wang Nan wrote:
> Original vmlinux_path__exit() doesn't revert vmlinux_path__nr_entries
> to its original state. After the while loop vmlinux_path__nr_entries
> becomes -1 instead of 0. This makes a problem that, if runs twice,
> during the second run vmlinux_path__init() will set vmlinux_path[-1]
> to strdup("vmlinux"), corrupts random memory.
> 
> This patch reset vmlinux_path__nr_entries to 0 after the while loop.
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


> ---
>  tools/perf/util/symbol.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index 201f6c4c..451777f 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1802,6 +1802,7 @@ static void vmlinux_path__exit(void)
>  {
>  	while (--vmlinux_path__nr_entries >= 0)
>  		zfree(&vmlinux_path[vmlinux_path__nr_entries]);
> +	vmlinux_path__nr_entries = 0;
>  
>  	zfree(&vmlinux_path);
>  }
> -- 
> 1.8.3.4
> 
> --
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